In a college math course, the instructor was interested in the average on the first exam and the sample deviation of the exam scores for her students. The following data is the scores for a sample of the 20 students in her course.

30; 45; 47; 55; 61; 65; 65; 71; 76; 76; 78; 80; 81; 84; 84; 84; 87; 89; 91; 95

1.Use the calculator to find the mean and the standard deviation

2.What data value is one standard deviation above the mean?

3.What data value is two standard deviations below the mean?